New Insights into the Electrochemical Behavior of Hematite ( α-FeO) Microparticles in Strong Aqueous Basic Electrolyte: Formation of Metallic Iron.
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| Title: | New Insights into the Electrochemical Behavior of Hematite ( α-FeO) Microparticles in Strong Aqueous Basic Electrolyte: Formation of Metallic Iron. |
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| Authors: | Minakshi, Manickam1 minakshi@murdoch.edu.au, Ralph, David1, Singh, Pritam2, Yin, Chun-Yang1 c.yin@murdoch.edu.au |
| Source: | Metallurgical & Materials Transactions. Part A. Apr2014, Vol. 45 Issue 4, p2023-2029. 7p. |
| Subjects: | Hematite crystals, Electrochemical metallizing, Metal microstructure, Aqueous electrolytes, Metal coating, Clathrate compounds |
| Abstract: | A detailed electrochemical study of cubic α-FeO microparticles has been carried out in strong aqueous LiOH electrolyte. The α-FeO was synthesized hydrothermally and investigated in the form of an electrochemical cell using an alkaline solution, ' α-FeO|LiOH (saturated), ZnSO (1 M)|Zn'. In this cell, the α-FeO cathode showed a reversible capacity of ca 220 mAh/g within cut-off voltages of 0 and 1.5 V under the constant current of 0.3 mA. The electrochemical performance was attributed to the reversible formation of both proton and lithium intercalation products (FeOOH and LiFeO) detected in the cathode material. Interestingly, at a lower discharge current of 0.1 mA, some of the hematite phase was reduced to metallic iron after yielding 336 mAh/g. The various possible electro-reduction reactions, which have direct electro-hydrometallurgical implications, are analyzed and discussed. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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